Prefabricated furnace



1951 J. 5. WALLIS ETAL PREFABRICATED FURNACE Filed Nov. 26, 1948 FIG.)

INVENTORS. JOHN WALLIS JOHN THROCKMORTON Mw/ ATTORNEY.

Patented Nov. 13, 1951 PREFABRICATED FURNACE John-S. Wallis andJohn W. -Throckmorton,.New; 1 JYork, N. 'Y.; 'assignors to Petro-Chem Process f Company: Incorporated, New York, N; Y, a

corporation of Delaware ApplicationNoveniber 26, 1948, Serial No. 62,192 p I g a I} l f 3Glaims; (01.12%356) This invention pertains to a type of furnace which may be completely prefabricated, with tubes and-burners installed in the shop. An obje'ctof theinvention is to provide a furn'acewhich is -peculiar1y adapted to be completely preiabricatedaiId-shipped to thesite completely assembled, and'is made ready for operation by simply putting the unit'on a foundation and bolting it in place.

Further and other objects and advantages will be apparent from thespecification and claims, and from the accompanying drawings which illustrate what is now -consideredto be a preferred embodiment ofthe invention.

Referring to the drawings:

Figure l is a vertical cross-section through the center of the structure;

Fig. 2 is a cross-section on line 2-2 of Fig. l; and

Fig. 3 is a cross-section on line 3-3 of Fig. 1.

The furnace comprises a vertical outer cylindrical shell l 0; within-which, and spacedfrom it, is a concentric inner shellor metal liner i2 supported by horizontal studs [4 having their heads welded to the shell and having their inner threaded-ends supporting bar rings IS.

ann lar-space-between shell lfiand liner I2is-occupiedbytwo layers of solid insulation I 8 such as monoblocr observation door is provided at 2t, thermometer-and draft gauge connectionsare provided as at 22, and flame control at 24.

A steel bottom plate 26 having a central openingand a depression to form anannular bottom well, is provided "at the bottom of the sheu' and the" well "is filled with concrete 23, leaving a center space for a burner 30.

The inlet for fluid to be heated is at 32 and the outlet at 34. The fluid travels through a ring of vertical tubes 36 connected at top and bottom by welded tube turns or return bends 38 and 40 respectively, the bottom turns resting in concrete 28. The tubes may be interconnected either in series or in multiple to form a continuous coil. The welded tube turns or return bends at the bottom are embedded in the concrete bottom and support the tubes and a hollow cone 44.

Supported on the upper tube turns by bolts 42 is the hollow cone 44 which is filled with vermiculite 46 covered by a layer of concretemix 48. The top of the cone is then closed with a metal cover plate 50 welded to the top of the cone, large enough to overhang and rest upon the upper tube turns to which it is fastened and perforated to receive the bolts 42.

he shell "to support the furnaceiat des d ei habove ground level;

The "lower. ends of legs 60; are

ioot -p'latesrtfl and brackets -64 to accommodate anchor bolts "66; vMountedon the. upperends of legs 6}} which extend-laterally beyond' the outer su jiaqgofthe shell viii, is a conical Smokestack 88, the bottom of which isof large; enough diameter topiovide an annular space 10 ,to admit'cool air to be drawn into the bottom. of the stack, alongjits, walls. .by

thermal 'actionwhen the :furnace is inoperation.

The smoke stack--68 is fastened to th less. :6 0;;by

bolts-12.

'It is to be. understood-that the: invention; is not limited: to the specific embodiment herein :illusg trated and described, but maybe used in other ways without departure from its-spirit" as Cdefined by theifollo'wing claims; I

'What is. claimed is:

" 1. A unitaryportable furnace .adaptedetogb e prefabric atedfor-shipment to the site, comprising concentric vertical cylindrical shells spaced one within the other by interposed layers insulating material, stiffening bar rings within the inner cylindrical shell and spaced longitudinally thereof, radial bolts tying-the outer and inner cylindrical shells together, holding the insulation in place and fastened to the bar rings at their inner ends to unify the structure, a bottom plate with a central opening and a depression to form an annular bottom well, a cylindrical bank of vertical tubes spaced within the inner shell and concentric therewith, return bends attached to the tubes and interconnecting them at their ends to form a continuous fluid heating coil, a concrete bottom filling the annular bottom well and embodying the bottom return bends of the coil so that the coil is solidly supported from the bottom by the concrete, a hollow sheet metal inverted cone filled with concrete and having a large circular disc top plate, the inverted bottom end of the cone and the disc being of such size that the cone fits within the upper ends of the tubes of the coil and the disc overlaps the tubes at the top and is bolted to the upper return bends, angle iron legs welded to the outer wall of the outer shell of thefu'rna'ce, extending with their upper ends flush-with-the shell at the top and elongated at the bottom to support the furnace well above the permanent base or floor to which the furnace is adapted to be secured, a conical chimney affixed to the top of the angle iron legs concentric with the furnace at the top and overhanging the furnace shell to form an annular cool air opening into the cone of the chimney, and a central axial burner mounted within the annular bottom well and afilxed thereto.

2. A unitary portable furnace adapted to be prefabricated for shipment to the site, comprising concentric vertical cylindrical shells spaced one within the other by interposed layers of solid insulating material, radial bolts tying the outer and inner cylindrical shells together and holding the insulation in place, a bottom plate with a central opening and a depression to form an annular bottom well, a cylindrical bank of vertical tubes spaced within the inner shell and concentric therewith, return bends attached to the tubes and interconnecting them at their ends to form a continuous fluid heating coil, a concrete bottom filling the annular bottom well and embodying the bottom return bends of the coil so that the coil is solidly supported from the bottom by the concrete, a hollow sheet metal inverted cone filled with concrete and having a large circular disc top plate, the inverted bottom end of the cone and the disc being of such size that the cone fits within the upper ends of the tubes of the coil and the disc overlaps the tubes at the top and is bolted to the upper return bends, angle iron legs welded to the outer wall of the outer shell of the furnace, extending with their upper ends flush with the shell at the top and elongated at the bottom to support the furnace well above the permanent base or floor to which it is adapted to be secured, a conical chimney afiixed to the top of the angle iron legs concentric with the furnace at the top and overhanging the furnace shell to form an annular cool air opening into the cone of the chimney, and a central axial burner mounted within the annular bottom well and affixed thereto.

3. A unitary portable furnace adapted to be prefabricated for shipment to the site, comprising concentric vertical cylindrical shells spaced one within the other by interposed layers of inconcentric therewith, return bends attached to the tubes and interconnecting them at their ends to form a continuous fluid heating coil, a concrete bottom filling the annular bottom well and embodying the bottom return bends of the coil so that the coil is solidly supported from the bottom by the concrete, a hollow sheet metal inverted cone having a large circular disc top plate, the

inverted bottom end of the cone and the disc bein of such size that the cone fits within the upper ends of the tubes. of the coil and the disc overlaps the tubes at the top and is bolted to the upper return bends, angle iron legs welded to the outer wall of the outer shell of the furnace, extending from the top of the shell well below the bottom of the shell to support the furnace, a conical chimney aflixed to the top of the angle iron legs concentric with the furnace at the top and overhanging the furnace shell to form an annular cool air opening into the cone of the chimney, and a central axial burner mounted within the annular bottom well and afilxed thereto.

JOHN S. WALLIS.

JOHN W. THROCKMORTON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENT Number Name Date 391,255 Laube Oct. 16, 1888 998,181 Jones July 18, 1911 1,049,388 Partridge Jan. 7, 1913 1,251,035 Humphrey Dec. 25, 1917 1,989,612 De Florez Jan. 29, 1935 2,031,610 Maker Feb. 25, 1936 2,035,167 Korach Mar. 24, 1936 2,224,544 Keller Dec. 10, 1940 2,372,991 Wallis et a1. Apr. 3, 1945' 2,385,749 Wallis et a1. Sept. 25, 1945 FOREIGN PATENTS Number Country Date 18,838 Great Britain 1905 126,219 Austria Jan. 11, 1932 

